U.S. patent application number 13/607361 was filed with the patent office on 2013-09-19 for optimized wakeup for communication devices.
This patent application is currently assigned to Qualcomm Incorporated. The applicant listed for this patent is Bhaskara V. Batchu, Venkata Siva Prasad Gude, Subbarayudu Mutya, Debesh Kumar Sahu. Invention is credited to Bhaskara V. Batchu, Venkata Siva Prasad Gude, Subbarayudu Mutya, Debesh Kumar Sahu.
Application Number | 20130242828 13/607361 |
Document ID | / |
Family ID | 47190166 |
Filed Date | 2013-09-19 |
United States Patent
Application |
20130242828 |
Kind Code |
A1 |
Sahu; Debesh Kumar ; et
al. |
September 19, 2013 |
OPTIMIZED WAKEUP FOR COMMUNICATION DEVICES
Abstract
Devices, systems, articles of manufacture, and methods for
optimized wake-up are described. According to some embodiments,
page messages are received at a page message receiving sub-slot.
The page messages can be received by a communication device's
communication interface, processes by a communication device's
processor, and stored in a communication device's memory. Upon
receiving page messages, a wake-up record is updated. A
communication device can enter sleep mode based in part on
reception of the page messages. Other aspects, embodiments, and
features are also claimed and described.
Inventors: |
Sahu; Debesh Kumar;
(Hyderabad, IN) ; Batchu; Bhaskara V.; (Ameenpur
Village, IN) ; Mutya; Subbarayudu; (Hyderabad,
IN) ; Gude; Venkata Siva Prasad; (Hyderabad,
IN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Sahu; Debesh Kumar
Batchu; Bhaskara V.
Mutya; Subbarayudu
Gude; Venkata Siva Prasad |
Hyderabad
Ameenpur Village
Hyderabad
Hyderabad |
|
IN
IN
IN
IN |
|
|
Assignee: |
Qualcomm Incorporated
San Diego
CA
|
Family ID: |
47190166 |
Appl. No.: |
13/607361 |
Filed: |
September 7, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61553777 |
Oct 31, 2011 |
|
|
|
Current U.S.
Class: |
370/311 |
Current CPC
Class: |
Y02D 30/70 20200801;
Y02D 70/1262 20180101; H04W 52/0229 20130101; Y02D 70/1242
20180101; H04W 52/0216 20130101; Y02D 70/142 20180101; Y02D 70/146
20180101 |
Class at
Publication: |
370/311 |
International
Class: |
H04W 52/02 20060101
H04W052/02 |
Claims
1. A method for optimized wake-up, comprising: receiving page
messages at a page message receiving sub-slot; updating a wake-up
record; and entering sleep mode.
2. The method of claim 1, further comprising: detecting a page
message in a sub-slot with a sub-slot number; and updating the
wake-up record based on the sub-slot number of the sub-slot.
3. The method of claim 2, wherein the wake-up record comprises: a
stored sub-slot number; and a counter.
4. The method of claim 3, wherein the sub-slot number of the
sub-slot does not match the stored sub-slot number, and wherein
updating the wake-up record based on the sub-slot number comprises:
resetting the count to 0; and setting the sub-slot number as the
stored sub-slot number.
5. The method of claim 4, further comprising resetting the page
message receiving sub-slot to a first sub-slot.
6. The method of claim 1, wherein updating the wake-up record
comprises determining if a sub-slot number of the page message
receiving sub-slot matches a stored sub-slot number, and if so
incrementing a count.
7. The method of claim 6, further comprising determining whether
the count is greater than or equal to a consecutive sub-slot
threshold.
8. The method of claim 7, wherein the count is greater than or
equal to the consecutive sub-slot threshold, and further comprising
adjusting the page message receiving sub-slot to the stored
sub-slot number.
9. The method of claim 7, wherein the consecutive sub-slot
threshold is adjustable.
10. The method of claim 1, wherein the wake-up record is for a
first PN code, and further comprising: moving from a first PN code
to a second PN code; storing the wake-up record for the first PN
code; and determining whether a wake-up record for the second PN
code has been created.
11. The method of claim 10, wherein a wake-up record for the second
PN code has been created, and further comprising using the wake-up
record for the second PN code.
12. The method of claim 10, wherein a wake-up record for the second
PN code has not been created, and further comprising: generating a
wake-up record for the second PN code; setting a stored sub-slot
number for the second PN code to a first sub-slot; initializing the
page message receiving sub-slot to the first sub-slot; and
initializing a count for the wake-up record for the second PN code
to 0.
13. The method of claim 1, wherein the method is performed by a
wireless communication device.
14. The method of claim 1, wherein the method increases a sleep
time of a wireless communication device.
15. The method of claim 1, wherein the method reduces an awake time
of one subscription in slotted mode, thereby reducing conflicts
between dual subscriptions wake-up in dual SIM dual standby
devices.
16. The method of claim 15, wherein the method improves call
performance in a wireless communication device, wherein call
performance comprises one of higher throughput, greater capacity,
and improved reliability.
17. The method of claim 1, wherein the method is performed by a
wireless communication device in at least one of a wireless network
and a roaming network.
18. The method of claim 1, wherein the paging message is received
via a paging channel.
19. The method of claim 1, wherein the paging message is not
received via a quick paging channel.
20. A wireless device configured for optimized wake-up, comprising:
a processor; memory in electronic communication with the processor;
instructions stored in the memory, the instructions being
executable by the processor to: receive page messages at a page
message receiving sub-slot; update a wake-up record; and enter
sleep mode.
21. The wireless device of claim 20, wherein the instructions are
further executable to: detect a page message in a sub-slot with a
sub-slot number; and update the wake-up record based on the
sub-slot number of the sub-slot.
22. The wireless device of claim 21, wherein the wake-up record
comprises: a stored sub-slot number; and a counter.
23. The wireless device of claim 22, wherein the sub-slot number of
the sub-slot does not match the stored sub-slot number, and wherein
updating the wake-up record based on the sub-slot number comprises:
resetting the count to 0; and setting the sub-slot number as the
stored sub-slot number.
24. The wireless device of claim 23, wherein the instructions are
further executable to reset the page message receiving sub-slot to
a first sub-slot.
25. The wireless device of claim 20, wherein updating the wake-up
record comprises determining if a sub-slot number of the page
message receiving sub-slot matches a stored sub-slot number, and if
so incrementing a count.
26. The wireless device of claim 25, wherein the instructions are
further executable to determine whether the count is greater than
or equal to a consecutive sub-slot threshold.
27. The wireless device of claim 26, wherein the count is greater
than or equal to the consecutive sub-slot threshold, and wherein
the instructions are further executable to adjust the page message
receiving sub-slot to the stored sub-slot number.
28. The wireless device of claim 26, wherein the consecutive
sub-slot threshold is adjustable.
29. The wireless device of claim 20, wherein the wake-up record is
for a first PN code, and wherein the instructions are further
executable to: move from a first PN code to a second PN code; store
the wake-up record for the first PN code; and determine whether a
wake-up record for the second PN code has been created.
30. The wireless device of claim 29, wherein a wake-up record for
the second PN code has been created, and wherein the instructions
are further executable to use the wake-up record for the second PN
code.
31. The wireless device of claim 29, wherein a wake-up record for
the second PN code has not been created, and wherein the
instructions are further executable to: generate a wake-up record
for the second PN code; set a stored sub-slot number for the second
PN code to a first sub-slot; initialize the page message receiving
sub-slot to the first sub-slot; and initialize a count for the
wake-up record for the second PN code to 0.
32. The wireless device of claim 20, wherein the wireless device is
a wireless communication device.
33. The wireless device of claim 20, wherein the wireless device
has an increased sleep time.
34. The wireless device of claim 20, wherein the wireless device
has a reduced awake time of one subscription in slotted mode,
thereby reducing conflicts between dual subscriptions wake-up in
dual SIM dual standby devices.
35. The wireless device of claim 34, wherein the wireless device
has improved call performance, wherein call performance comprises
one of higher throughput, greater capacity, and improved
reliability.
36. The wireless device of claim 20, wherein the wireless device is
in at least one of a wireless network and a roaming network.
37. The wireless device of claim 20, wherein the paging message is
received via a paging channel.
38. The wireless device of claim 20, wherein the paging message is
not received via a quick paging channel.
39. A computer-program product for optimized wake-up, the
computer-program product comprising a non-transitory
computer-readable medium having instructions thereon, the
instructions comprising: code for causing a wireless device to
receive page messages at a page message receiving sub-slot; code
for causing the wireless device to update a wake-up record; and
code for causing the wireless device to enter sleep mode.
40. The computer-program product of claim 39, the instructions
further comprising: code for causing the wireless device to detect
a page message in a sub-slot with a sub-slot number; and code for
causing the wireless device to update the wake-up record based on
the sub-slot number of the sub-slot.
41. The computer-program product of claim 40, wherein the wake-up
record comprises: a stored sub-slot number; and a counter.
42. The computer-program product of claim 39, wherein the code for
causing the wireless device to update the wake-up record comprises
code for causing the wireless device to determine if a sub-slot
number of the page message receiving sub-slot matches a stored
sub-slot number, and if so incrementing a count.
43. A wireless communication device configured to periodically wake
up for wireless communications, the device comprising: a
communications interface configured to receive a wireless signal;
and a processor operatively coupled to the communications
interface, configured to: wake up the device if the processor
detects a page message in the wireless signal at a pre-determined
sub-slot number; update a wake-up record; and return to sleep
mode.
44. The wireless communication device of claim 43, wherein the
processor is further configured to: detect a page message in a
sub-slot with a sub-slot number at the pre-determined sub-slot; and
update the wake-up record based on the sub-slot number of the
sub-slot.
45. The wireless communication device of claim 44, wherein the
wake-up record comprises: a stored sub-slot number; and a
counter.
46. The wireless communication device of claim 43, wherein updating
the wake-up record comprises determining if a sub-slot number of
the pre-determined sub-slot matches a stored sub-slot number, and
if so incrementing a count.
47. A wireless device configured for optimized wake-up, comprising:
means for receiving page messages at a page message receiving
sub-slot; means for updating a wake-up record; and means for
entering sleep mode.
48. The wireless device of claim 47, further comprising: means for
detecting a page message in a sub-slot with a sub-slot number; and
means for updating the wake-up record based on the sub-slot number
of the sub-slot.
49. The wireless device of claim 48, wherein the wake-up record
comprises: a stored sub-slot number; and a counter.
50. The wireless device of claim 47, wherein the means for updating
the wake-up record comprises means for determining if a sub-slot
number of the page message receiving sub-slot matches a stored
sub-slot number, and if so incrementing a count.
Description
RELATED APPLICATION AND PRIORITY CLAIM
[0001] This application is related to and claims priority to U.S.
Provisional Patent Application Ser. No. 61/553,777, filed Oct. 31,
2011, for "OPTIMIZED WAKEUP" which is incorporated herein by
reference for all purposes and as if fully set forth below.
TECHNICAL FIELD
[0002] The present disclosure relates generally to wireless
communication systems. More specifically, the present disclosure
relates to systems and methods for optimized wakeup enabling
efficient operation of communication devices.
BACKGROUND
[0003] Wireless communication systems are widely deployed to
provide various types of communication content such as voice,
video, data and so on. These systems may be multiple-access systems
capable of supporting simultaneous communication of multiple mobile
devices with one or more base stations.
[0004] Within wireless communications systems, base stations may
periodically send page messages to mobile devices residing in
wireless networks. Page messages may notify a mobile device of an
incoming voice call or give channel assignments to a mobile device.
To receive these page messages, the mobile device needs to wake-up
from sleep mode. Current wake-up methods can be improved.
SUMMARY OF SOME EXAMPLE EMBODIMENTS
[0005] Devices, systems, articles of manufacture, and methods for
optimized wake-up are described. According to one embodiment, a
method for optimized wake-up is disclosed. Page messages are
received at a page message receiving sub-slot. A wake-up record is
updated. Sleep mode is entered. Other aspects, embodiments, and
features are also claimed and described.
[0006] A page message may be detected in a sub-slot with a sub-slot
number. The wake-up record may be updated based on the sub-slot
number of the sub-slot. The wake-up record may include a stored
sub-slot number and a counter. The sub-slot number of the sub-slot
may not match the stored sub-slot number. Updating the wake-up
record based on the sub-slot number may include resetting the count
to 0, and setting the sub-slot number as the stored sub-slot
number. The page message receiving sub-slot may be reset to a first
sub-slot.
[0007] Updating the wake-up record may include determining if a
sub-slot number of the page message receiving sub-slot matches a
stored sub-slot number, and if so incrementing a count. The method
may also include determining whether the count is greater than or
equal to a consecutive sub-slot threshold. If the count is greater
than or equal to the consecutive sub-slot threshold, the method may
include adjusting the page message receiving sub-slot to the stored
sub-slot number. The consecutive sub-slot threshold may be
adjustable.
[0008] The wake-up record may be for a first PN code, and a method
may also include, moving from a first PN code to a second PN code,
storing the wake-up record for the first PN code, and determining
whether a wake-up record for the second PN code has been created. A
wake-up record for the second PN code may have been created and the
method may include using the wake-up record for the second PN code.
A wake-up record for the second PN code may not have been created,
and the method may include generating a wake-up record for the
second PN code, setting a stored sub-slot number for the second PN
code to a first sub-slot, initializing the page message receiving
sub-slot to the first sub-slot, and initializing a count for the
wake-up record for the second PN code to 0.
[0009] The method may be performed by a wireless communication
device. The method may increase a sleep time of a wireless
communication device. The method may reduce the awake time of one
subscription in slotted mode. This can aid to reduce conflicts
between dual subscriptions wake-up in dual SIM dual standby
devices. The method may improve call performance in a wireless
communication device. Call performance may include higher
throughput, greater capacity, or improved reliability. The method
may be performed by a wireless communication device in at least one
of a wireless network and a roaming network.
[0010] The paging message may be received via a paging channel. The
paging message may not be received via a quick paging channel.
[0011] According to another embodiment, a wireless device
configured for optimized wake-up is described. The wireless device
includes a processor and executable instructions stored in memory
that is in electronic communication with the processor. The
wireless device receives page messages at a page message receiving
sub-slot. The wireless device also updates a wake-up record. The
wireless device additionally enters sleep mode.
[0012] According to yet another embodiment, a computer-program
product for optimized wake-up is described. The computer-program
product includes a non-transitory computer-readable medium having
instructions thereon. The computer-program product includes
instructions for receiving page messages at a page message
receiving sub-slot. The computer-program product also includes
instructions for updating a wake-up record. The computer-program
product further includes instructions for entering sleep mode.
[0013] According to still yet another embodiment, a wireless
communication device configured to periodically wake up for
wireless communications is described. The wireless communication
device includes a communications interface configured to receive a
wireless signal. The wireless communication device includes also a
processor. The processor is operatively coupled to the
communications interface and is configured to wake up the device if
the processor detects a page message in the wireless signal at a
pre-determined sub-slot number. The processor is also configured to
update a wake-up record. The processor is further configured to
return to sleep mode.
[0014] According to yet another embodiment, a wireless device
configured for optimized wake-up is described. The apparatus
includes means for receiving page messages at a page message
receiving sub-slot. The apparatus also includes means for updating
a wake-up record. The apparatus further includes means for entering
sleep mode.
[0015] Other aspects, features, and embodiments of the present
invention will become apparent to those of ordinary skill in the
art, upon reviewing the following description of specific,
exemplary embodiments of the present invention in conjunction with
the accompanying figures. While features of the present invention
may be discussed relative to certain embodiments and figures below,
all embodiments of the present invention can include one or more of
the advantageous features discussed herein. In other words, while
one or more embodiments may be discussed as having certain
advantageous features, one or more of such features may also be
used in accordance with the various embodiments of the invention
discussed herein. In similar fashion, while exemplary embodiments
may be discussed below as device, system, or method embodiments it
should be understood that such exemplary embodiments can be
implemented in various devices, systems, and methods.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 shows an example of a wireless communication system
in which embodiments of the present invention disclosed herein may
be utilized;
[0017] FIG. 2 shows a block diagram of a transmitter and a receiver
in a wireless communication system according to some embodiments of
the present invention;
[0018] FIG. 3 shows a block diagram of a design of a receiver unit
and demodulator at a receiver according to some embodiments of the
present invention;
[0019] FIG. 4 shows a wireless communication system with multiple
wireless devices in which embodiments of the present invention
disclosed herein may be utilized;
[0020] FIG. 5 shows a timing diagram of the optimized wake-up mode
of a wireless communication device according to some embodiments of
the present invention;
[0021] FIG. 6 shows another timing diagram of the optimized wake-up
mode of a wireless communication device according to some
embodiments of the present invention;
[0022] FIG. 7 shows a flow diagram illustrating a method for
optimizing wake-up according to some embodiments of the present
invention;
[0023] FIG. 8 shows a flow diagram illustrating a method for
optimized wake-up during a switch of pseudonoise (PN) codes
according to some embodiments of the present invention; and
[0024] FIG. 9 shows certain components that may be included within
a wireless communication device according to some embodiments of
the present invention.
DETAILED DESCRIPTION OF ALTERNATIVE & EXEMPLARY EMBODIMENTS
[0025] More and more people are using wireless communication
devices, for example, mobile phones, not only for voice but also
for data communications. CMDA2000 is one such standard used for
providing voice, data, and signaling services to and from wireless
communication devices. A CDMA network may implement a radio
technology such as Universal Terrestrial Radio Access (UTRA),
CDMA2000, etc. UTRA includes W-CDMA and Low Chip Rate (LCR) while
CDMA2000 covers Interim Standard 2000 (IS-2000), IS-95, and IS-856
standards. A TDMA network may implement a radio technology such as
Global System for Mobile Communications (GSM). An OFDMA network may
implement a radio technology such as Evolved UTRA (E-UTRA), IEEE
802.11, IEEE 802.16, IEEE 802.20, Flash-OFDMA, etc. UTRA, E-UTRA
and GSM are part of Universal Mobile Telecommunication System
(UMTS). Long Term Evolution (LTE) is a release of UMTS that uses
E-UTRA. UTRA, E-UTRA, GSM, UMTS and Long Term Evolution (LTE) are
described in documents from an organization named "3rd Generation
Partnership Project" (3GPP). CDMA2000 is described in documents
from an organization named "3rd Generation Partnership Project 2"
(3GPP2).
[0026] In CDMA2000, a paging channel is used to transmit page
messages to wireless communication devices in standby mode (also
called idle mode). During standby mode, a wireless communication
device continuously consumes power to sustain the circuitry needed
to monitor the signals transmitted from a base station. Continual
monitoring of the paging channel for page messages in standby mode
may significantly deplete battery power. In other words, elongating
the time taken to monitor the paging channel results in excess
power consumption. Because many wireless communication devices are
portable and are powered by an internal battery, prolonging
monitoring time unnecessarily consumes power and significantly
shortens battery life. Depleted power resources can lead to poor
user experience and also failed communications. Thus, reducing
standby time on the wireless communication device will reduce power
consumption and can aid in providing positive user experience.
[0027] FIG. 1 shows an example of a wireless communication system
100 in which embodiments of the present invention disclosed herein
may be utilized. The wireless communication system 100 includes
multiple base stations 102 and multiple wireless communication
devices 104. The wireless communication system 100 may be designed
to implement one or more CDMA standards such as CDMA2000 and
wideband code division multiple access (W-CDMA) and/or some other
standards.
[0028] Each base station 102 provides communication coverage for a
particular geographic area 106. The term "cell" can refer to a base
station 102 and/or its coverage area 106 depending on the context
in which the term is used. The terms "networks" and "systems," as
used herein, are sometimes used interchangeably.
[0029] The terms "wireless communication device" and "base station"
utilized in this application can generally refer to an array of
components. For example, as used herein, the term "wireless
communication device" refers to an electronic device that may be
used for voice and/or data communication over a wireless
communication system. Examples of wireless communication devices
104 include cellular phones, smart phones, personal digital
assistants (PDAs), handheld devices, wireless modems, laptop
computers, personal computers, and many other portable or
stationary devices capable of wireless communication. A wireless
communication device 104 may alternatively be referred to as an
access terminal, a mobile terminal, a mobile station, a remote
station, a user terminal, a terminal, a subscriber unit, a
subscriber station, a mobile device, a wireless device, user
equipment (UE) or some other similar terminology. A wireless
communication device may be used in a wireless network and/or a
roaming network.
[0030] The term "base station" can refer to a wireless
communication station that is installed at a fixed location and
used to communicate with wireless communication devices 104. A base
station 102 may alternatively be referred to as an access point
(including nano-, pico- and femto-cells), a Node B, an evolved Node
B, a Home Node B, or some other similar terminology. In some
embodiments, base stations 102 may be mobile and can be
repositioned as desired or needed for adequate network
coverage.
[0031] To improve system capacity, a base station coverage area 106
may be partitioned into multiple smaller areas, e.g., three smaller
areas 108a, 108b, and 108c. Each smaller area 108a, 108b, 108c may
be served by a respective base transceiver station (BTS). The term
"sector" can refer to a BTS and/or its coverage area 106 depending
on the context in which the term is used. For a sectorized cell,
the BTSs for all sectors of that cell are typically co-located
within the base station 102 for the cell.
[0032] Wireless communication devices (e.g., subscriber stations)
104 are typically dispersed throughout the wireless communication
system 100. A wireless communication device 104 may communicate
with one or more base stations 102 on the downlink and/or uplink at
any given moment. The downlink (or forward link) refers to the
communication link from a base station 102 to a wireless
communication device 104, and the uplink (or reverse link) refers
to the communication link from a wireless communication device 104
to a base station 102. Uplink and downlink may refer to the
communication link or to the carriers used for the communication
link.
[0033] For a centralized architecture, a system controller 110 may
couple to the base stations 102 and provide coordination and
control for the base stations 102. The system controller 110 may be
a single network entity or a collection of network entities. As
another example, for a distributed architecture, base stations 102
may communicate with one another as needed. Thus embodiments of the
present invention can be used with various network architectures
although certain embodiments of the present invention may be
discussed herein as relating to CDMA-type networks.
[0034] FIG. 2 shows a block diagram of a transmitter 211 and a
receiver 213 in a wireless communication system 100 according to
some embodiments of the present invention. For the downlink, the
transmitter 211 may be part of a base station 102 and the receiver
213 may be part of a wireless communication device 104. For the
uplink, the transmitter 211 may be part of a wireless communication
device 104 and the receiver 213 may be part of a base station 102.
In some embodiments, receivers and transmitters can be combined or
implemented as a transceiver.
[0035] At the transmitter 211, a transmit (TX) data processor 234
receives and processes (e.g., formats, encodes, and interleaves)
data 238 and provides coded data. The transmit (TX) data processor
234 may also receive page messages from a controller 214. A
modulator 212 performs modulation on the coded data and provides a
modulated signal. For IS-95 and CDMA2000 systems, the processing by
modulator 212 may include covering coded and pilot data with Walsh
codes to channelize user-specific data, messages, and pilot data
onto their respective code channels and spreading the channelized
data with a pseudorandom number (PN) sequence having a particular
PN offset assigned to the base station. A transmitter unit (TMTR)
218 conditions (e.g., filters, amplifies, and upconverts) the
modulated signal and generates an RF modulated signal, which is
transmitted via an antenna 220.
[0036] At the receiver 213, an antenna 222 receives RF modulated
signals from the transmitter 211 and other transmitters. The
antenna 222 provides a received RF signal to a receiver unit (RCVR)
224. The receiver unit 224 conditions (e.g., filters, amplifies,
and downconverts) the received RF signal, digitizes the conditioned
signal, and provides samples. A demodulator 226 processes the
samples as described below and provides demodulated data. For IS-95
and CDMA2000 systems, the processing by demodulator 226 includes
despreading the data samples with the same PN sequence used to
spread the data at the base station, decovering the despread
samples to channelize the received data and messages onto their
respective code channels and coherently demodulating the
channelized data with a pilot recovered from the received signal. A
receive (RX) data processor 228 processes (e.g., deinterleaves and
decodes) the demodulated data and provides decoded data 232. In
general, the processing by demodulator 226 and RX data processor
228 is complementary to the processing by the modulator 212 and the
TX data processor 234, respectively, at the transmitter 211.
[0037] Controllers/processors 214 and 230 direct operation at the
transmitter 211 and receiver 213, respectively. Memories 216 and
236 store program codes in the form of computer software and data
used by the transmitter 211 and receiver 213, respectively.
[0038] FIG. 3 shows a block diagram of a design of a receiver unit
324 and a demodulator 326 at a receiver 213 according to some
embodiments of the present invention. Within the receiver unit 324,
a receive chain 342 processes the received RF signal and provides I
(inphase) and Q (quadrature) baseband signals, which are denoted as
I.sub.bb and Q.sub.bb. The receive chain 342 may perform low noise
amplification, analog filtering, quadrature downconversion, etc. as
desired or needed. An analog-to-digital converter (ADC) 344
digitalizes the I and Q baseband signals at a sampling rate of
f.sub.ad, from a sampling clock 340 and provides I and Q samples,
which are denoted as I.sub.adc and Q.sub.adc. In general, the ADC
sampling rate f.sub.adc may be related to the symbol rate f.sub.sym
by any integer or non-integer factor.
[0039] Within the demodulator 326, a pre-processor 346 performs
pre-processing on the I and Q samples from the analog-to-digital
converter (ADC) 344. For example, the pre-processor 346 may remove
direct current (DC) offset, remove frequency offset, etc. An input
filter 348 filters the samples from the pre-processor 346 based on
a particular frequency response and provides input I and Q samples,
which are denoted as I.sub.in and Q.sub.in. The input filter 348
may filter the I and Q samples to suppress images resulting from
the sampling by the analog-to-digital converter (ADC) 344 as well
as jammers. The input filter 348 may also perform sample rate
conversion, e.g., from 24.times. oversampling down to 2.times.
oversampling. A data filter 350 filters the input I and Q samples
from the input filter 348 based on another frequency response and
provides output I and Q samples, which are denoted as I.sub.out and
Q.sub.out. The input filter 348 and the data filter 350 may be
implemented with finite impulse response (FIR) filters, infinite
impulse response (IIR) filters or filters of other types. The
frequency responses of the input filter 348 and the data filter 350
may be selected to achieve good performance. In one design, the
frequency response of the input filter 348 is fixed and the
frequency response of the data filter 350 is configurable.
[0040] An adjacent-channel-interference (ACI) detector 354 receives
the input I and Q samples from the input filter 348, detects for
adjacent-channel-interference (ACI) in the received RF signal and
provides an adjacent-channel-interference (ACI) indicator 356 to
the data filter 350. The adjacent-channel-interference (ACI)
indicator 356 may indicate whether or not
adjacent-channel-interference (ACI) is present and, if present,
whether the adjacent-channel-interference (ACI) is due to the
higher RF channel centered at +200 kilohertz (kHz) and/or the lower
RF channel centered at -200 kHz. The frequency response of the data
filter 350 may be adjusted based on the
adjacent-channel-interference (ACI) indicator 356, to achieve
desirable performance.
[0041] An equalizer/detector 352 receives the output I and Q
samples from the data filter 350 and performs equalization, matched
filtering, detection and/or other processing on these samples. For
example, the equalizer/detector 352 may implement a maximum
likelihood sequence estimator (MLSE) that determines a sequence of
symbols that is most likely to have been transmitted given a
sequence of I and Q samples and a channel estimate.
[0042] FIG. 4 shows a wireless communication system 400 with
multiple wireless devices in which embodiments of the present
invention disclosed herein may be utilized. The wireless
communication system 400 of FIG. 4 may be one example of the
wireless communication system 100 described above in connection
with FIG. 1. For example, the base station 402 and wireless
communication device 404 of FIG. 4 may correspond to the base
station 102 and wireless communication device 104 of FIG. 1,
respectively.
[0043] Communications in the wireless communications system 400
(e.g., a multiple-access system) may be achieved through
transmissions over one or more wireless links, such as a downlink
480 or an uplink 482. The communication link may be established via
a single-input and single-output (SISO), multiple-input and
single-output (MISO) or a multiple-input and multiple-output (MIMO)
system. A MIMO system includes transmitter(s) and receiver(s)
equipped, respectively, with multiple (N.sub.T) transmit antennas
and multiple (N.sub.R) receive antennas for data transmission. SISO
and MISO systems are particular instances of a MIMO system. The
MIMO system can provide improved performance (e.g., higher
throughput, greater capacity or improved reliability) if the
additional dimensionalities created by the multiple transmit and
receive antennas are utilized.
[0044] A MIMO system may support both time division duplex (TDD)
and frequency division duplex (FDD) systems. In a TDD system,
downlink 480 and uplink 482 transmissions are on the same frequency
region so that the reciprocity principle allows the estimation of
the downlink channel from the uplink channel. This enables a
transmitting wireless device to extract transmit beamforming gain
from communications received by the transmitting wireless
device.
[0045] The wireless communication system 400 may be a
multiple-access system capable of supporting communication with
multiple wireless communication devices 404 by sharing available
system resources (e.g., bandwidth and transmit power). Examples of
such multiple-access systems include code division multiple access
(CDMA) systems, wideband code division multiple access (W-CDMA)
systems, time division multiple access (TDMA) systems, frequency
division multiple access (FDMA) systems, orthogonal frequency
division multiple access (OFDMA) systems, single-carrier frequency
division multiple access (SC-FDMA) systems, 3rd Generation
Partnership Project (3GPP) Long Term Evolution (LTE) systems and
spatial division multiple access (SDMA) systems.
[0046] A wireless communication device 404 may communicate with
zero, one or multiple base stations 402 on the downlink 480 and/or
uplink 482 at any given moment. As described above, the downlink
480 (or forward link) refers to the communication link from a base
station 402 to a wireless communication device 404, and the uplink
482 (or reverse link) refers to the communication link from a
wireless communication device 404 to a base station 402.
[0047] A wireless communication device 404 may operate in several
modes or states, such as active mode, standby mode, and inactive
mode. In active mode, the wireless communication device can
actively exchange data with one or more base stations 402 (e.g.,
voice or data). In standby mode (i.e., idle mode), the wireless
communication device 404 may monitor a paging channel for messages,
such as general page messages (GPM) or direct messages addressed to
the wireless communication device 404. In inactive or sleep mode,
the wireless communication device 404 reduces power consumption by
powering down as much circuitry as possible. In other words, in
inactive or sleep mode, the wireless communication device 404 does
not monitor the paging channel or perform access procedures.
[0048] The power consumption by the wireless communication device
404 in the standby mode decreases the available battery resources.
This generally shortens the time between battery recharges. Power
consumption in the standby mode is typically many times greater
than that in the inactive mode. Any reduction in the amount of time
spent in the standby mode may result in a direct and significant
improvement in overall battery life of the wireless communication
device 404. Therefore, it is desirable to minimize the wireless
communication device's 404 power consumption in the standby mode to
increase battery life. Power efficiency and conservation also
becomes increasingly important as wireless communication devices
become more feature rich.
[0049] In one configuration, to reduce power consumption in standby
mode, messages on the paging channel may be sent to a wireless
communication device 404 at designated times. For example, in
CDMA2000 systems, the paging channel is divided into numbered
"slots" (i.e., a slotted paging channel). Each slot may correlate
to a slot cycle index (SCI).
[0050] The base stations 402 may assign one or more slots to the
wireless communication device 404 to receive page messages. For
example, under the IS-2000 standard, the paging channel is
partitioned into two paging channel slots, each having an 80
millisecond (msec) duration. Each paging channel slot is further
partitioned into four 20 msec frames or sub-slots. A group of
wireless communication devices 404 may be assigned to each paging
channel slot.
[0051] In a slotted paging channel, the wireless communication
device 404 periodically, rather than continuously, monitors the
paging channel for messages from the base station 402. In other
words, the wireless communication device 404 may wake up at certain
slots (corresponding to the slot cycle index (SCI) assigned to the
wireless communication device) to decode page messages. The
wireless communication device 404 wakes up from inactive mode prior
to its assigned slot or sub-slot, switches into standby mode to
detect the page message and enters active mode to processes the
paging channel for messages. In other words, the wireless
communication device 404 may wake-up at (e.g., just prior to) a
pre-determined sub-slot number to process a page message received
via wireless signals. The wireless communication device 404 may
revert back to inactive mode if additional communication is not
required. In this manner, power is conserved by reducing standby
mode time.
[0052] In this configuration, the wireless communication device 404
will remain in the active or awake state if a received message
requires the wireless communication device 404 to perform
additional actions. When not in a standby or active state, the
wireless communication device 404 reverts back to inactive mode.
However, this configuration may be problematic because, if the base
station 402 sends a page messages to the wireless communication
device 404 while in inactive or sleep mode, the page messages will
not be detected by the wireless communication device 404.
[0053] Additionally, under this configuration, if the base station
402 changes slots or sub-slots in which page messages are sent, the
wireless communication device 404 may continuously miss page
messages from the base station 402. Alternatively, if the base
station 402 sends page messages in a different slot than currently
assigned to the wireless communication device 404, the wireless
communication device 404 may be awake until the page message is
detected. In other words, the wireless communication device 404
will be unnecessarily awake for slots in which no page messages are
being sent and power will be needlessly wasted.
[0054] In another configuration of a slotted paging channel, a
wireless communication device 404 remains awake for the two 80 msec
slots to detect page messages from the base station 402 or until a
page message is received. The two slots may each be divided into
four 20 msec sub-slots. In this configuration, the wireless
communication device 404 may be required to remain awake for eight
20 msec (e.g., 160 msec).
[0055] In an optimal network, a base station 402 always sends the
wireless communication device 404 a page message during the first
sub-slot. This will allow the wireless communication device 404 to
enter sleep mode shortly after the page message is received. In
this way, the time spent in inactive mode is increased because the
wireless communication device 404 will not be continuously
searching for page messages in standby mode.
[0056] In a non-optimal network, the base station 402 may send the
wireless communication device 404 a page message during a later
sub-slot. A base station 402 may send a page message at a later
sub-slot to ensure that all wireless communication devices 404
receive the page messages. However, this approach can be
inefficient because it causes wireless communication devices 404
remain in standby mode for longer periods than necessary. Thus,
when the base station 402 sends a page message to a wireless
communication device 404 later than in the first sub-slot, the
wireless communication device 404 will remain in standby mode for
additional sub-slots for which no information is being received or
decoded. For example, if the base station 402 sends the wireless
communication device 404 a page message in the eighth sub-slot, the
wireless communication device 404 may remain in standby mode
unnecessarily for the first seven sub-slots (i.e., 140 msec).
[0057] In another configuration, a wireless communication device
404 may employ a quick paging channel (QPCH). A QPCH is a separate
channel from the paging channel. The QPCH does not receive page
messages, but rather is used to detect bits that inform the
wireless communication device 404 whether to switch from inactive
mode to standby mode to receive a page message on the paging
channel.
[0058] The QPCH is used in conjunction with the paging channel and
functions like a control channel for the paging channel. Each QPCH
slot is associated with a corresponding paging channel slot, but is
transmitted before the associated paging channel slot. For example,
slot 2 of the QPCH slot is transmitted 100 milliseconds (msec)
before slot 2 of the paging channel. A paging indicator bit, or
bits, on the QPCH alerts the wireless communication device 404 that
a coded page message is about to be transmitted on the paging
channel in the associated paging channel slot. However, the QPCH
may fail to receive or decode the paging indication bit(s). In this
case, the page message sent to the paging channel will also fail to
be received and decoded by the wireless communication device
404.
[0059] The QPCH may also send false alarms to the wireless
communication device 404. In the case of a false alarm, the QPCH
informs the wireless communication device 404 that a paging message
is to be received in the next slot when no paging message is
present. This causes the wireless communication device 404 to waste
power by operating in standby mode when no page messages are being
received.
[0060] As stated previously, the base station 402 may send a page
message to the wireless communication device 404. The page message
may be a direct page message 486 or a general page message. In some
instances, the general page message (GPM) may be an empty general
page message 488. Additionally or alternatively, the direct page
message 486 may also be a general page message.
[0061] The base station 402 may include a page message module 484
that generates and sends a direct page message 486 and/or an empty
general page message 488 to the wireless communication device 404.
The wireless communication device 404 may also detect the direct
page message 486 and/or the empty general page message 488. The
wireless communication device 404 may also detect data for the next
message that is not required for the page matching algorithm.
[0062] Direct page messages 486 may alert the wireless
communication device 404 to the presence of incoming call system
update parameters (e.g., overhead messages). If the wireless
communication device 404 detects a direct page message 486, the
wireless communication device 404 may perform access
procedures.
[0063] An empty general page message (GPM) 488 may indicate that
all the direct page messages 486 have been sent by the base station
402. If the wireless communication device 404 detects an empty
general page message 488, the wireless communication device 404 may
immediately go to sleep (e.g., inactive mode) instead of waiting
for further page messages.
[0064] In one configuration in which embodiments of the present
invention disclosed herein may be utilized, the wireless
communication device 404 can include an optimized wake-up module
460. The optimized wake-up module 460 can help to increase sleep
time. The optimized wake-up module 460 may allow the wireless
communication device 404 to adjust the wake-up time of the wireless
communication device 404 to a sub-slot later than the first
sub-slot. In this manner, the wireless communication device 404 may
enter standby mode in the same sub-slot as when the page message is
being received. Thus, the amount of time the wireless communication
device 404 is unnecessarily in standby mode is decreased.
[0065] Additionally, the optimized wake-up module 460 may reduce
the standby time of one subscription in slotted mode. In this
manner, the optimized wake-up module 460 may reduce the conflicts
between dual subscriptions wakeup in Dual SIM Dual Standby (DSDS)
devices (or any device containing multiple SIMs).
[0066] The optimized wake-up module 460 may include one or more
wake-up records 462. Each wake-up record 462 may correspond to a
stored sub-slot number 464, a count 466, a cell ID 468, a PN
(pseudonoise) code 470 and/or a record ID 472. The number of
wake-up records 462 on the optimized wake-up module 460 may depend
on the number of cell IDs 468 and PN codes 470 available to the
wireless communication device 404.
[0067] Only one wake-up record 462 may be active at a time. The
active wake-up record 462 may correspond to the current cell ID 468
and current PN code 470 of the wireless communication device 404.
Table 1 illustrates two wake-up records 462.
TABLE-US-00001 TABLE 1 Record ID Cell ID PN Code Stored Sub-Slot
Number Count 0 Cellid1 PN1 Sub-slot Number Count1 1 Cellid1 PN2
Sub-slot Number Count2
[0068] The stored sub-slot number 464 may refer to the sub-slot or
frame where a page message was recently decoded. In other words,
the stored sub-slot number 464 may refer to the specific sub-slot
for which the wireless communication device 404 was required to be
in standby mode to detect and decode the page message. The base
station 402 may assign and reassign the required sub-slot where the
page message is to be received and decoded. Based on the sub-slot
assignment by the base station 402, the wireless communication
device 404 may change and/or update the stored sub-slot number 464.
In other words, the new sub-slot number replaces the stored
sub-slot number 464
[0069] In some instances, the wake-up record 462 may have only one
stored sub-slot number 464. This may occur when the stored sub-slot
number 464 is the sub-slot number for which the wake-up record 462
is currently counting. In other words, the base station 402 is
sending page messages during the same sub-slot number as the stored
sub-slot number 464. For example the base station 402 sends the
page message during sub-slot 6 when the stored sub-slot number 464
is sub-slot 6.
[0070] When the wireless communication device 404 decodes a page
message in a sub-slot, the count 466 is saved and/or incremented.
If the wireless communication device 404 decodes a page message in
a sub-slot that has the same sub-slot number as the stored sub-slot
number 464, the count may be incremented. If the wireless
communication device 404 decodes a page message in a sub-slot that
has a different sub-slot number than the stored sub-slot number
464, the stored sub-slot number 464 may be set to the new sub-slot
number and the count 466 may be reset (i.e., set to 0).
[0071] For example, if an empty general page message (GPM) 488 or a
direct page message 486 is detected in the third sub-slot, the
stored sub-slot number may be set to 3 and the count 466 may be set
to 0. If the wireless communication device 404 subsequently (i.e.,
in the next slot corresponding to the slot cycle index (SCI)
assigned to the wireless communication device 404) decodes another
empty general page message 488 or a direct page message 486 in the
third sub-slot, the stored sub-slot number may remain at 3 and the
count may be incremented to 1. This process may be repeated as
shown in Table 2 below. For example, the wireless communication
device may receive two additional page messages, as shown in record
ID 472 2 and 3 in Table 2.
TABLE-US-00002 TABLE 2 Record ID Cell ID PN Code Stored Sub-Slot
Number Count 0 Cellid1 PN1 Sub-slot 3 0 1 Cellid1 PN1 Sub-slot 3 1
2 Cellid1 PN1 Sub-slot 3 2 3 Cellid1 PN1 Sub-slot 3 3 4 Cellid1 PN2
Sub-slot 4 0
[0072] If the wireless communication device 404 subsequently
decodes a page message in the fourth sub-slot, the stored sub-slot
number 464 may be set to 4 and the count 466 may be reset to 0, as
shown record ID 472 4 in Table 2. It should be noted that while
multiple records are displaced for sub-slot 3 (e.g., record IDs 472
0-3), a single wake-up record 462 could be employed for sub-slot 3
where only the count 466 changes for each additional page message
received at sub-slot 3. Under this latter approach, record ID 472 0
in Table 2 would correlate to sub-slot 3 and record ID 472 1 would
correlate to sub-slot 4.
[0073] In some configurations, when the wireless communication
device 404 subsequently decodes a page message in a sub-slot where
it has previously counted, but is not currently counting, the count
466 may be either be reset to 0 or the count 466 may continue to be
incremented. For example, in Table 2, if the wireless communication
device 404 subsequently decodes a page messages in the third
sub-slot, record ID 472 5 (not shown) may either reset to 0 or may
be incremented to 4.
[0074] The wireless communication device 404 may also include a
consecutive sub-slot threshold 474. The consecutive sub-slot
threshold 474 may be a predefined threshold. In one configuration,
the consecutive sub-slot threshold 474 may be configurable (e.g.,
adjustable or variable). For example, if the consecutive sub-slot
threshold 474 is configurable, the base station 102 may change or
update the consecutive sub-slot threshold 474 on the wireless
communication device 404.
[0075] When the count is equal to or greater than the consecutive
sub-slot threshold 474, the optimized wake-up module 460 may set a
page message receiving sub-slot 476 to the stored sub-slot number
464. The page message receiving sub-slot 476 may indicate to the
wireless communication device 404 which sub-slot the wireless
communication device 404 should begin receiving page messages.
Initially, the page message receiving sub-slot 476 may be set to
the first sub-slot (e.g., the slot boundary). Whenever the count
466 is reset (e.g., set to 0), the page message receiving sub-slot
476 may also be reset to the first sub-slot. For example, if the
page message receiving sub-slot 476 is set to the third sub-slot,
the wireless communication device 404 may remain asleep during the
first sub-slot and the second sub-slot, but wake up to receive page
messages and perform page matching prior to the third sub-slot.
[0076] Using optimized wake-up may increase the sleep mode time of
the wireless communication device 404. Depending, on the sub-slot
in which the page message is transmitted, different increases in
sleep mode duration may be achieved. Table 3 below shows the
percentage of increase in sleep mode time based on the sub-slot
number in which the page message is transmitted.
TABLE-US-00003 TABLE 3 Sub-slot Time in Time in Sleep Mode Time
Number in Standby Mode Standby Mode Percentage of which the (if in
(if using Increase (using Page Message Standby from optimized
optimized is Transmitted sub-slot 1) wake-up) wake-up) 2 40 ms 20
ms 100% 3 60 ms 20 ms 200% 4 80 ms 20 ms 300% 5 100 ms 20 ms 400% 6
120 ms 20 ms 500% 7 140 ms 20 ms 600%
[0077] Table 3 shows that the optimized wake-up module 460 can
reduce the amount of standby time the wireless communication device
404 spends in standby mode monitoring for the page message.
Optimized wake-up may be implemented with software changes in
1.times.Layer3 and 1.times.Layer1.
[0078] In addition, in low end chipsets, increases in sleep mode
time may be very beneficial. For example, optimized wake-up may be
useful in dual SIM dual standby (DSDS). A wireless communication
device 404 that uses dual SIM dual standby (DSDS) may be any
wireless communication device 404 that is capable of communicating
using more than one radio access technology (RAT). For example, the
optimized wake-up module 460 may reduce conflicts between CDMA and
GSM wake-up.
[0079] Multiple SIM technology, such as Dual SIM dual standby
(DSDS), is a popular feature in China, India, South East Asia,
Latin America, and other markets. To be competitive in markets
utilizing dual SIM dual standby (DSDS), a wireless communication
device 404 may need to have optimal power consumption and lower
hardware cost. For example, a wireless communication device 404
that has higher power consumption and a dual receiver may be unable
to compete in a dual SIM dual standby (DSDS) market. Thus, reducing
the hardware cost and power consumption of a dual SIM dual standby
(DSDS) wireless communication device 404 is desirable.
[0080] FIG. 5 shows a timing diagram of the optimized wake-up mode
of a wireless communication device 104 according to some
embodiments of the present invention. The timing diagram includes a
slot of a paging channel separated into four sub-slots 527a-d or
frames. The sub-slots 527a-d may be divided by sub-slot boundaries
541 with slot boundaries 529. For simplicity, only one slot
boundary 529 and sub-slot boundary 541 is labeled. In some
configurations, the sub-slots 527a-d may be 20 millisecond (msec)
in duration and may combine to from one of the two 80 msec
partitioned paging channel slots, as defined under the IS-2000
standard. Additionally, the sub-slot 527a-d may correlate to a slot
cycle index (SCI).
[0081] In the timing diagram shown, the page message receiving
sub-slot 476 may be set to sub-slot 3 (i.e., the third sub-slot
527c). When the page message receiving sub-slot 476 is set to
sub-slot 3, the wireless communication device 104 does not wake-up
(e.g., is in sleep mode 525a-b and does not enter standby mode) to
receive page messages and perform page matching until just prior to
the third sub-slot 527c. Thus, the wireless communication device
104 may remain in sleep mode 525 during the first sub-slot 527a and
the second sub-slot 527b. Prior to the third sub-slot 527c, the
wireless communication device 104 may wake-up in time to perform
warm up procedures 533 and reacquire procedures 535. Reacquire
procedures 535 may include synchronizing with the base station 102,
aligning with the base station 102, determining which base station
102 is optimal, etc.
[0082] The wireless communication device 104 may receive 531 page
messages during the third sub-slot 527c. It is assumed for this
example that the base station 102 is sending the page message
during the third sub-slot 527c. If the base station 102 does not
send the page message in the third sub-slot 527c, the wireless
communication device 104 may remain awake until either the page
message is received 531 or the eighth sub-slot (not shown) is
completed. If the page message is not included in any of the
sub-slots subsequent to the third sub-slot 527c, the wireless
communication device 104 may reset the page message receiving
sub-slot 476 to the first sub-slot 527a, the stored sub-slot number
464 in the wake-up record 462 to the first sub-slot 527c and the
count in the wake-up record 462 to 0. In this manner, the wake-up
record 462 may be updated.
[0083] If the wireless communication device 104 receives 531 a page
message in the third sub-slot 527c, the wireless communication
device 104 may increment the count 466 in the wake-up record 462.
The wireless communication device 104 may employ decode page
message procedures 537. If the page message is an empty general
page message (GPM) 488, the wireless communication device 104 may
enter sleep mode 525d immediately (e.g., in the fourth sub-slot
527d). If the page message is a direct page message 486, the
wireless communication device 104 may perform access procedures
539d.
[0084] If the wireless communication device 104 subsequently
receives a page message in the second sub-slot 527b, the wireless
communication device 104 may reset the count 466 in the wake-up
record 462. Additionally, the wireless communication device 104 may
create a new wake-up record 462 indicating the stored sub-slot
number 464 as the second sub-slot 527b rather that the third
sub-slot 527c. This is shown in greater detail below in FIG. 6.
[0085] It should be noted that the timing diagram of FIG. 5
illustrates the timing for a page message received via the paging
channel and not data or bits received on the quick paging channel
(QPCH). The wireless communication device 104 described herein
monitors the paging cannel, not the QPCH. In other words, the
paging message is not received via a quick paging channel.
[0086] The embodiments of the present invention described herein
may work with or without the presence of a QPCH. In the case of a
QPCH, the QPCH may fail or miss a page indicator bit indicating a
forthcoming paging message. In this case, the wireless
communication device 104 will wake-up and monitor for a paging
message based on the optimized wake-up module 460.
[0087] FIG. 6 shows another timing diagram of the optimized wake-up
mode of a wireless communication device 104 according to some
embodiments of the present invention. The timing diagram of FIG. 6
may include slot boundaries 629, sub-slot boundaries 641, sub-slots
627a-d, warm-up procedures 633, reacquire procedures 635 and decode
page message procedures 637 similar to corresponding elements 529,
541, 527a-d, 533, 535 and 537 described above in connection with
FIG. 5. The sub-slot 627a-d may correlate to a slot cycle index
(SCI).
[0088] If the wireless communication device 104 subsequently
receives a page message in the second sub-slot 527b, the wireless
communication device 104 may reset the count 466 in the wake-up
record 462. Additionally, the wireless communication device 104 may
create a new wake-up record 462 indicating the stored sub-slot
number 464 as the second sub-slot 527b rather that the third
sub-slot 527c.
[0089] In the timing diagram shown, the page message receiving
sub-slot 476 may be set to sub-slot 2 (i.e., the second sub-slot
627b) when a page message is received in the second sub-slot 627b.
If the page message receiving sub-slot 476 was set to a sub-slot
627 other than the second sub-slot 627b, the wireless communication
device 104 may change the page message receiving sub-slot 476 to
the second sub-slot 627b.
[0090] However, in some instances, the wireless communication
device 104 may not change the page message receiving sub-slot 476
to the second sub-slot 627b until the consecutive sub-slot
threshold 474 has been met or exceeded. For example, the wireless
communication device 104 may receive four subsequent page messages
in the second sub-slot 627b, making the count 466 in the wake-up
record 462 for that record ID 472 equal to 4. The wireless
communication device 104 may then receive a single page message in
the fourth sub-slot 627d. If the consecutive sub-slot threshold 474
is set to be greater than or equal to 3, the wireless communication
device 104 may not change the page message receiving sub-slot
476.
[0091] Then if the wireless communication device 104 again receives
a subsequent page message in the second sub-slot 627b, the count
466 for the original record may be incremented and the page message
receiving sub-slot 476 may remain the second sub-slot 627b. In this
manner, if the base station 102 sends a limited number of page
messages in different sub-slots 627a-d, the wireless communication
device 104 may still perform an optimized wake-up procedure when
the base station 102 again sends page messages to the sub-slot
627a-d that correlates to the stored sub-slot number 464 in the
wake-up record 462. Further, periodic page messages received at
different sub-slots 627a-d due to errors, reflections, etc., will
have a minimal effect on the optimized wake-up procedure.
[0092] Returning to FIG. 6, when the page message receiving
sub-slot 476 is set to the second sub-slot 627b, the wireless
communication device 104 does not wake-up (e.g., is in sleep mode
625a) to receive page messages and perform page matching until the
second sub-slot 627b. Thus, the wireless communication device 104
may remain in sleep mode 625a during the first sub-slot 627a. Prior
to the second sub-slot 627b, the wireless communication device 104
may wake-up in time to perform warm-up procedures 633 and reacquire
procedures 635. This optimized wake-up procedure allows the
wireless communication device 104 to remain in sleep mode 625 for a
longer period of time.
[0093] The wireless communication device 104 may receive a page
message 631 during the second sub-slot 627b. It is assumed for this
example that the base station 102 is sending the page message
during the second sub-slot 627b. If the wireless communication
device 104 receives a page message 631 in the second sub-slot 627b,
the wireless communication device 104 may increment the count 466
in the wake-up record 462. The wireless communication device 104
may also employ decode page message procedures 637. If the page
message is an empty general page message (GPM) 488, the wireless
communication device 104 may enter sleep mode 625c immediately
(e.g., in the third sub-slot 627c) and continue in sleep mode 625d
in the fourth sub-slot 627d.
[0094] If the page message is a direct page message 486, the
wireless communication device 104 may perform access procedures
639c in the third sub-slot 627c and, if necessary, perform access
procedures 639d in the fourth sub-slot 627d. If the wireless
communication device 104 has completed the access procedures 639c
in the third sub-slot 627c, the wireless communication device 104
may enter sleep mode 625d in the fourth sub-slot 627d. Overall, the
optimized wake-up procedures as described in the embodiments of the
present invention allow the wireless communication device 104 to
remain in standby mode for less time, which leads to an increase in
power savings.
[0095] FIG. 7 shows a flow diagram illustrating a method 700 for
optimizing wake-up according to some embodiments of the present
invention. The method 700 may be performed by a wireless
communication device 104. The wireless communication device 104 may
receive 702 page messages at a page message receiving sub-slot 476.
As discussed above, the page message receiving sub-slot 476 may be
one of the sub-slots (e.g., sub-slots 527a-d) corresponding to the
slot cycle index (SCI) assigned to the wireless communication
device 104. The wireless communication device 104 may detect 704 an
empty general page message (GPM) 488 and/or direct page message 486
in a sub-slot 527a-d.
[0096] The sub-slot 527a-d may correspond to a sub-slot number. For
example, the second sub-slot 527b may correspond to sub-slot number
2. The wireless communication device 104 may then determine 706
whether the sub-slot number matches the stored sub-slot number 464
in the active wake-up record 462.
[0097] If the sub-slot number in which the page message was
detected 704 is not the stored sub-slot number 464, the wireless
communication device 104 may reset 708 the page message receiving
sub-slot 476 to the first sub-slot (e.g., first sub-slot 527a). The
wireless communication device 104 may also reset 710 the count 466
for the wake-up record 462 to 0. The wireless communication device
104 may set 712 the sub-slot number as the stored sub-slot number
464. Performing the steps of resetting 708 the page message,
resetting 710 the count 466 and/or setting 712 the sub-slot number
464 may update the wake-up record 462.
[0098] The wireless communication device 104 may determine 720 if
the received page message is an empty general page message (GPM)
488 or a direct page message 486. If the received page message is
an empty general page message (GPM) 488, the wireless communication
device 104 may enter 722 sleep mode. In this case, the wireless
communication device 104 may enter sleep mode until the next
sub-slot defined by the page message receiving sub-slot 476. The
wireless communication device 104 may than begin the method 700
over again.
[0099] If the received page message is a direct page message 486,
the wireless communication device 104 may perform 724 access
procedures. Once access procedures have been performed 724, the
wireless communication device 104 may enter 722 sleep mode. The
wireless communication device 104 may than begin the method 700
over again.
[0100] If sub-slot number in which the page message was detected
704 is the stored sub-slot number 464, the wireless communication
device 104 may increment 714 the count 466 for the wake-up record
462. In this manner, the wake-up record 462 is updated. The
wireless communication device 104 may then determine 716 whether
the count 466 is greater than or equal to a consecutive sub-slot
threshold 474.
[0101] If the count 466 is greater than or equal to the consecutive
sub-slot threshold 474, the wireless communication device 104 may
adjust 718 the page message receiving sub-slot 476 to the stored
sub-slot number 464, which updates the wake-up record 462. Based on
the determination 720, the wireless communication device 104 either
enters 722 sleep mode or performs 724 access procedures, as
described above. The wireless communication device 104 may than
begin the method 700 over again.
[0102] If the count 466 is not greater than or equal to the
consecutive sub-slot threshold 474, the wireless communication
device 104 may make no adjustments to the page message receiving
sub-slot 476. The wireless communication device 104 may then
determine 720 if the received page message is an empty general page
message (GPM) 488 or a direct page message 486. Based on the
determination 720, the wireless communication device 104 either
enters 722 sleep mode or performs 724 access procedures, as
described above. The wireless communication device 104 may than
begin the method 700 over again.
[0103] FIG. 8 shows a flow diagram illustrating a method 800 for
optimized wake-up during a switch of pseudonoise (PN) codes 470
according to some embodiments of the present invention. The method
800 may be performed by a wireless communication device 104. The
wireless communication device 104 may have an established wake-up
record 462 for a first PN code. The wireless communication device
104 move 802 from the first PN code to a second PN code of the home
system. The wireless communication device 104 may store 804 the
wake-up record 462 for the first PN code. For example, the wake-up
record 462 for the first PN code may be stored 804 for future
use.
[0104] The wireless communication device 104 may determine 806
whether the second PN code has a corresponding wake-up record 462.
In other words, the wireless communication device 104 may determine
whether a wake-up record 462 for the second PN code is established.
If a wake-up record 462 for the second PN code is established, the
wireless communication device 104 may use 816 the wake-up record
462 for the second PN code. In this manner, the wireless
communication device 104 may switch from the wake-up record 462 for
the first PN code to the wake-up record 462 for the second PN
code.
[0105] If a wake-up record 462 for the second PN code is not
established, the wireless communication device 104 may generate 808
a new wake-up record 462 for the second PN code. The wireless
communication device 104 may set 810 the stored sub-slot number 464
for the wake-up counter for the second PN code to the first
sub-slot (e.g., first sub-slot 527a).
[0106] The wireless communication device 104 may initialize 812 the
page message receiving sub-slot 476 to the first sub-slot (e.g.,
first sub-slot 527a). The wireless communication device 104 may
initialize 814 the count 466 for the wake-up record 462 for the
second PN code to 0.
[0107] FIG. 9 shows certain components that may be included within
a wireless communication device 904 according to some embodiments
of the present invention. The wireless communication device 904 may
be an access terminal, a mobile station, a user equipment (UE),
etc. The wireless communication device 904 includes a processor
903. For example the wireless communication device 904 may be the
wireless communication device 104 of FIG. 1 and/or the wireless
communication device 404 of FIG. 4.
[0108] The processor 903 may be a general purpose single- or
multi-chip microprocessor (e.g., an ARM), a special purpose
microprocessor (e.g., a digital signal processor (DSP)), a
microcontroller, a programmable gate array, etc. The processor 903
may be referred to as a central processing unit (CPU). Although
just a single processor 903 is shown in the wireless communication
device 904 of FIG. 9, in an alternative configuration, a
combination of processors (e.g., an ARM and DSP) could be used.
[0109] The wireless communication device 904 also includes memory
905. The memory 905 may be any electronic component capable of
storing electronic information. The memory 905 may be embodied as
random access memory (RAM), read-only memory (ROM), magnetic disk
storage media, optical storage media, flash memory devices in RAM,
on-board memory included with the processor, EPROM memory, EEPROM
memory, registers and so forth, including combinations thereof.
[0110] Data 907a and instructions 909a may be stored in the memory
905. The instructions 909a may be executable by the processor 903
to implement the methods disclosed herein. Executing the
instructions 909a may involve the use of the data 907a that is
stored in the memory 905. When the processor 903 executes the
instructions 909, various portions of the instructions 909b may be
loaded onto the processor 903, and various pieces of data 907b may
be loaded onto the processor 903.
[0111] The wireless communication device 904 may also include a
transmitter 911 and a receiver 913 to allow transmission and
reception of signals to and from the wireless communication device
904 via an antenna 917. The transmitter 911 and receiver 913 may be
collectively referred to as a transceiver 915. The wireless
communication device 904 may also include (not shown) multiple
transmitters, multiple antennas, multiple receivers and/or multiple
transceivers.
[0112] The wireless communication device 904 may include a digital
signal processor (DSP) 921. The wireless communication device 904
may also include a communications interface 923. The communications
interface 923 may allow a user to interact with the wireless
communication device 904.
[0113] The various components of the wireless communication device
904 may be coupled together by one or more buses, which may include
a power bus, a control signal bus, a status signal bus, a data bus,
etc. For the sake of clarity, the various buses are illustrated in
FIG. 9 as a bus system 919.
[0114] The techniques described herein may be used for various
communication systems, including communication systems that are
based on an orthogonal multiplexing scheme. Examples of such
communication systems include Orthogonal Frequency Division
Multiple Access (OFDMA) systems, Single-Carrier Frequency Division
Multiple Access (SC-FDMA) systems and so forth. An OFDMA system
utilizes orthogonal frequency division multiplexing (OFDM), which
is a modulation technique that partitions the overall system
bandwidth into multiple orthogonal sub-carriers. These sub-carriers
may also be called tones, bins, etc. With OFDM, each sub-carrier
may be independently modulated with data. An SC-FDMA system may
utilize interleaved FDMA (IFDMA) to transmit on sub-carriers that
are distributed across the system bandwidth, localized FDMA (LFDMA)
to transmit on a block of adjacent sub-carriers, or enhanced FDMA
(EFDMA) to transmit on multiple blocks of adjacent sub-carriers. In
general, modulation symbols are sent in the frequency domain with
OFDM and in the time domain with SC-FDMA.
[0115] The term "determining" encompasses a wide variety of actions
and, therefore, "determining" can include calculating, computing,
processing, deriving, investigating, looking up (e.g., looking up
in a table, a database or another data structure), ascertaining and
the like. Also, "determining" can include receiving (e.g.,
receiving information), accessing (e.g., accessing data in a
memory) and the like. Also, "determining" can include resolving,
selecting, choosing, establishing and the like.
[0116] The phrase "based on" does not mean "based only on," unless
expressly specified otherwise. In other words, the phrase "based
on" describes both "based only on" and "based at least on."
[0117] The term "processor" should be interpreted broadly to
encompass a general purpose processor, a central processing unit
(CPU), a microprocessor, a digital signal processor (DSP), a
controller, a microcontroller, a state machine, and so forth. Under
some circumstances, a "processor" may refer to an application
specific integrated circuit (ASIC), a programmable logic device
(PLD), a field programmable gate array (FPGA), etc. The term
"processor" may refer to a combination of processing devices, e.g.,
a combination of a digital signal processor (DSP) and a
microprocessor, a plurality of microprocessors, one or more
microprocessors in conjunction with a digital signal processor
(DSP) core, or any other such configuration.
[0118] The term "memory" should be interpreted broadly to encompass
any electronic component capable of storing electronic information.
The term memory may refer to various types of processor-readable
media such as random access memory (RAM), read-only memory (ROM),
non-volatile random access memory (NVRAM), programmable read-only
memory (PROM), erasable programmable read-only memory (EPROM),
electrically erasable PROM (EEPROM), flash memory, magnetic or
optical data storage, registers, etc. Memory is said to be in
electronic communication with a processor if the processor can read
information from and/or write information to the memory. Memory
that is integral to a processor is in electronic communication with
the processor.
[0119] The terms "instructions" and "code" should be interpreted
broadly to include any type of computer-readable statement(s). For
example, the terms "instructions" and "code" may refer to one or
more programs, routines, sub-routines, functions, procedures, etc.
"Instructions" and "code" may comprise a single computer-readable
statement or many computer-readable statements.
[0120] The functions described herein may be implemented in
software or firmware being executed by hardware. The functions may
be stored as one or more instructions on a computer-readable
medium. The terms "computer-readable medium" or "computer-program
product" refers to any tangible storage medium that can be accessed
by a computer or a processor. By way of example, and not
limitation, a computer-readable medium may comprise RAM, ROM,
EEPROM, CD-ROM or other optical disk storage, magnetic disk storage
or other magnetic storage devices, or any other medium that can
carry or store desired program code in the form of instructions or
data structures and that can be accessed by a computer. Disk and
disc, as used herein, includes compact disc (CD), laser disc,
optical disc, digital versatile disc (DVD), floppy disk and
Blu-Ray.RTM. disc where disks usually reproduce data magnetically,
while discs reproduce data optically with lasers. It should be
noted that a computer-readable medium may be tangible and
non-transitory. The term "computer-program product" refers to a
computing device or processor in combination with code or
instructions (e.g., a "program") that may be executed, processed or
computed by the computing device or processor. As used herein, the
term "code" may refer to software, instructions, code or data that
is/are executable by a computing device or processor.
[0121] Software or instructions may also be transmitted over a
transmission medium. For example, if the software is transmitted
from a website, server, or other remote source using a coaxial
cable, fiber optic cable, twisted pair, digital subscriber line
(DSL), or wireless technologies such as infrared, radio, and
microwave, then the coaxial cable, fiber optic cable, twisted pair,
DSL, or wireless technologies such as infrared, radio, and
microwave are included in the definition of transmission
medium.
[0122] The methods disclosed herein comprise one or more steps or
actions for achieving the described method. The method steps and/or
actions may be interchanged with one another without departing from
the scope of the claims. In other words, unless a specific order of
steps or actions is required for proper operation of the method
that is being described, the order and/or use of specific steps
and/or actions may be modified without departing from the scope of
the claims.
[0123] Further, it should be appreciated that modules and/or other
appropriate means for performing the methods and techniques
described herein, such as those illustrated by FIG. 7 and FIG. 8,
can be downloaded and/or otherwise obtained by a device. For
example, a device may be coupled to a server to facilitate the
transfer of means for performing the methods described herein.
Alternatively, various methods described herein can be provided via
a storage means (e.g., random access memory (RAM), read-only memory
(ROM), a physical storage medium such as a compact disc (CD) or
floppy disk, etc.), such that a device may obtain the various
methods upon coupling or providing the storage means to the
device.
[0124] It is to be understood that the claims are not limited to
the precise configuration and components illustrated above. Various
modifications, changes and variations may be made in the
arrangement, operation and details of the systems, methods, and
apparatus described herein without departing from the scope of the
claims.
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